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RELEVANT LEARNING OUTCOME:
(c) Explain how and why different substances move across membranes through simple diffusion, osmosis, facilitated diffusion, active transport, endocytosis and exocytosis.
Diffusion is regarded as a passive process because it does not require the expenditure of energy by the cell. The energy for the movement of substances across the membrane is provided by the kinetic energy of the particles themselves.
The particles will diffuse down a concentration gradient until they are uniformly distributed throughout the system.
Some particles are small enough to travel in between the phospholipids of the cell membrane, and so they cross the membrane by simple diffusion. Larger particles will require help in the form of proteins, and they cross the membrane by facilitated diffusion.
💡Simple and Facilitated Diffusion
💡Simple and Facilitated Diffusion
👁️🗨️Watch the video to learn about how simple and facilitated diffusion works, and the factors that would affect how particles are transported through these mechanisms.
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